McMurdo Municipal Government plants artificial trees throughout across the city scape because no natural trees are able to live in such an extreme climate. McMurdo is notable for having the largest underground city in the world. The McMurdo Subterranean Subway and Shopping Plaza (MSSSP) takes up 1.4 square miles of space beneath the city of McMurdo. The Triple S-P, as it is sometimes referred to, has hotels, shops, theaters, offices, 3 swimming pools, 2 artificial beaches, 2 heavy rail lines and much more. It is estimated that over 150,000 people visit the underground city everyday. The 2125 census even revealed that 17,984 people live in the MSSSP.